diff --git a/after/syntax/css/geometry-1.vim b/after/syntax/css/geometry-1.vim
new file mode 100644
index 0000000..dd72adc
--- /dev/null
+++ b/after/syntax/css/geometry-1.vim
@@ -0,0 +1 @@
+" N/A
diff --git a/after/syntax/html.vim b/after/syntax/html.vim
index f86286f..73d0353 100644
--- a/after/syntax/html.vim
+++ b/after/syntax/html.vim
@@ -53,6 +53,7 @@ syn include @htmlCss syntax/css/css3-transitions.vim
 syn include @htmlCss syntax/css/cssom-view.vim
 syn include @htmlCss syntax/css/cssom.vim
 syn include @htmlCss syntax/css/filter-effects.vim
+syn include @htmlCss syntax/css/geometry-1.vim
 syn include @htmlCss syntax/css/html5-elements.vim
 syn include @htmlCss syntax/css/motion-1.vim
 syn include @htmlCss syntax/css/selectors-nonelement-1.vim
diff --git a/test/test.css b/test/test.css
index f0a3207..9843108 100644
--- a/test/test.css
+++ b/test/test.css
@@ -273,6 +273,10 @@
   display: closed;
 }
 
+.geometry-1 {
+  display: auto;
+}
+
 .grid {
   grid-template-columns: grid;
   grid-template-rows: inline-grid;
diff --git a/test/test.html b/test/test.html
index e2741c1..7872c10 100644
--- a/test/test.html
+++ b/test/test.html
@@ -306,6 +306,11 @@
 }
 </style>
 <style>
+.geometry-1 {
+  display: auto;
+}
+</style>
+<style>
 .grid {
   grid-template-columns: grid;
   grid-template-rows: inline-grid;